Four equations showing reactions of nitrogen or a compound of nitrogen are given. Which equation shows a disproportionation reaction?
- A$\text{2HNO}_3 + \text{CaCO}_3 \rightarrow \text{Ca(NO}_3)_2 + \text{CO}_2 + \text{H}_2\text{O}$
- B$\text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3$
- C$\text{NH}_4\text{Cl} + \text{NaOH} \rightarrow \text{NH}_3 + \text{NaCl} + \text{H}_2\text{O}$
- D$2\text{NO}_2 + \text{H}_2\text{O} \rightarrow \text{HNO}_3 + \text{HNO}_2$